Improvement in devices for attaching booms to masts



EQROGERS; improvement in Devices for Attaching Beams to Masts.

Patented May 23 at We nznmnt scenes, 0F warnnrosnassicnon TO HIMSELF ANDH.

a ROWN, onnnw LONDON, CONNECTICUT.

Letters Patent No. 115,241, dated May 23,1871.

IMPROVEMENT m DEVICES FOR ATTACHING Booms TO MASTS.

The Schedule referred to in these Letters Patent'and making part of thesame.

To all whom itvmay come m i Be it known that I,:EZE-KIE;L ROGERS, of thetown of Waterford, and county of New London and State of Connecticut,have invented a newand useful De-- vice for Attaching Booms 'toMasts. Vr

1 My invention consists, in pivoting the jaws of the boom tohoppositesides of a jointed shackle; and I do hereby declare-that thefollowingspecification, taken in connection with the d-rawing furnished andforming a part of the same, is a c1ear,true, and exact descriptionthereof. 1

1 Referring to the drawing- Figure lrepresents, in perspective, a mastwith-a boom attached thereto by means of my improved de-- vice; i

U Figure 2 represents, in perspective, the jointed shackle detachedffromthe boom and mast.

Aistheh1ast. i r

j B,othe"boom. i O and, O arefthe jaws of the boom.

D is. themainportionjof theshackle. At its-opposite sides are projectingspots or studs'd. e and e arestraps attached to the two jaws, of the aboom, Each of these straps embraces one of the'studs d, thuspermanentlyconnecting with the jaws of the boom themain portion D ofthe shackle. Fis a binding-strap P01 auxiliary portion of the shackle. It completesthe embracing circle. Its ends are connected, by ears and slots, to thecorresponding ends, of the main portion of the shackle.

The interior of the main and auxiliary portions of the shackle are linedwith wood, so that no undue wear or friction can. occcur between themand the must at the points of contact It-is desirable inboom-connections to have a free vertical movement when desired, and onewhich, while it connects the boom firmly to the mast, will also admit ofthe greatest possible freedom of a semi-rotary movement withoutmaterially chafing or defacing the mast at the point of contact.

It will be observed that in hoisting the boom like the one hereindescribed the shackle is lifted evenly,

on the mast whether the end of the boom be elevated or depressed, andthat no cloggingof the shackle can possibly be effected by the positionof the boom.

For mounting gafls I employ only the main shackle D, which is pivoted,as already described, to theirjaws. 1 Having thus described myinvention, I claim as new and desire to secure by Letters Pat-.ent--- 1. The semicircular shackle D, provided with projeoting studs dfor connecting with the jaws of the boom, and the binding-strap E, thetwo being con-

